Composition for generating formaldehyde.



UNITED S ATES ]fA'l ENT oFmoE.

ARTHUR EIC'HENHRUN, OF DUSSELDQRF. GERMANY, ASSIGNOR TO FARBENFABRIREN VURM. F-RI EUR. 51A NY'.

ll.\ YiElt & (Oh-0F ELBERFELT), GERMANY, A (ORPURATION ()F GER- COMPOSITION FOR GENERATING FORMALDEHYDE.

, Patented April 21, 1008.

Application filed October 15, 1907. Serial No. 337,515.

The resent application relates to the same su ject matter of invention as that for l which I have .alre'adv tiled application Serial No. 319,963 June 2nd 1906.

The salts are mixed referably with paraformaldehyde, and su sequently water is added to the mixture. The mixtures of the salts with the polymeric form-aldehyde may be ressed into pastils or larger pieces, and in t is form are ready to use.

The reaction which takes lace on addition of Water results very probab y in the delpolymerization of para-formaldehyde, am the consequent generation of formaldehyde at tion of fixed alkaline compounds, such as -sodium carbonate, calcium carbonate, sodium hydroxid, or the like.- For carrying out this manner of proceeding, e. g. equal parts of sodium 'hydroxid, potassium permanganate and para-formaldehyde are mixed, and to the resulting mixture double the quantity of water is added. A lively evolution of gas takes place, and streams of formaldehyde and steam are given off which can be made use of for disinfecting closed rooms. The

uantity of water used can be increased.

ganic acid react in an analogpus manner, for example. 2 parts of sodium ydroxid, -1'part ther salts of the above-mentioned perman of potassium per:nangam'ite, 1 part of permanganate of barium, 2 parts of para-foe maldehyde are mixed and to the resulting 1115 xt-ure double the quantity of water is added. A lively evolution of gas takes place and off, which can be made use of for disinfecting closed rooms. Instead of 1 part of sodium hydroxid in the above exam les' I can also employ 1 part. of potassium lydroxid'o'r 1% parts of sodium carbonate or 11 parts of potassium carbonate. Or a stream'of formaldehyde gas, mixed with steam can also be generated if one part of paraform and one part of potassium permanganate are mixed, and to the resulting mixture double the quantity of water is added.

Having now, described my invention and in what manner the same is to be performed,

""Letters Patent, is

1. A composition of matter generating gaseous formaldehyde and water vapor when treated with water, and consisting of a mixture of polymeric formaldehyde with salts of permanganic acid, substantially as hereinbeore described- I 2. A composition of matter generating gaseous formaldehyde and water vapor when treated with water, and consisting of a mixture of para-formaldehyde with salts of ermanganlc acid, substantially as hereinbe ore described.

3. A composition of matter generating when treated with water, and consisting ofa mixtureof para-formaldehyde with permanganate of potassium, substantially as hereinbefore described.

aseous formaldehyde and water vapor when reated with water, and consisting of a mixture of polymeric formaldehyde with salts of permanganic acid and fixed alkaline comscribed.

gaseous formaldehyde and water vapor when treated with water; and consisting of a mixture of pa'ra-formaldeh *de with salts of permanganic acid and fixed alkaline compounds,

substantially as hereinbeforedescribed.

streams of formaldehyde and steam are given "what I claim asnew' and desire to secure by 4.. A composition of matter generating 5. A composition of 'matter generating .gaseous formaldehyde and water vapor pounds, substantially as hereinbefore dey 2 I seems U. A composition .of matter generating I In testirnon'y whereof I have hereunto set gaseous formaldehyde and Water Vapor when my hand in the presence of two subscribing treated with Water, and consisting of a miX- witnesses. ture of ara formaldehyde with permanv r 5 ganate o't pqtassium and fixed alkehne com- Witnesses:

'pouilds, substantially 22s hereinbefore de- WM. WASHINGTON BRUNSWICK, scribed OTTO KJZSNIG.

ARTHUR EICHENGIHFN. [11.8.] 

